About a week ago, I mentioned these books in another ETS Forums post about gardening... but it probably bears repeating here:
"The Joy of Gardening", by Dick Raymond ... and "Burpee : The Complete Vegetable & Herb Gardener".

Those are both large books with tons of information for (vegetable) gardeners. You'll find quite a bit of overlap between those books; but, I find that I refer to both books constantly.
The Dick Raymond book is a bit older; and he liked to fire up the Rototiller a bit more than most gardeners will probably want to these days. But, he seems to really love the craft of gardening, and that comes through in his writing... that makes his book a very enjoyable read for me.